The Iowa Gambling Task (IGT) has been used to measure decision making skills in a sample of human binge (≥5 drinks on one occasion, more than one time in the past 30 days) and nonbinge alcohol drinkers. Diminished IGT performance was found in chronic high-binge drinkers (binge drinking 2 or more times a week 95% of the time) compared with low-binge drinkers (binge drinking 2 or more times a week 3% of the time). Heavy drinkers and possible alcohol dependent/abusers were included, and it was acknowledged that the findings did not permit differentiation of whether the quantity/frequency of drinking or the pattern of drinking was the cause of the diminished IGT performance (Goudriaan, Grekin, & Sher, 2007).
